How will morality questions be settled in the domain of self-driving cars?
I don't think these questions will need to be answered.

A self driving car will almost certainly avoid a situation like the ones described well before a human would have and hence would not have to choose. 

For example it would slow down as soon as it sees a child close to the road. It will identify and react to the fact that the child starts moving towards the road and act before the situation requires the "drastic" scenarios that we invent. 

If for some reason the car has to choose, it can also make the impact/avoidance have the highest chance of not killing the occupant of the vehicle considering how well designed cars are these days and that the speeds involved shouldn't be anything wild like 200mph.

Not to mention a network of cars along with street cameras and sensors would act/work together to resolve as a swarm intelligence so the car ahead or the traffic camera can warn/tell other cars that something they cannot see is a potential hazard. I can go on and on...

In my opinion, the bottom line is a self driving car will not road rage, drive at dangerous speeds in a residential area, get tired and fall asleep, text and drive or drink and drive, etc... I cannot wait.